70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/*
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* Copyright (C) 2013 Tobias Brunner
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/**
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* @defgroup iv iv
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* @{ @ingroup crypto
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*/
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#ifndef IV_GEN_H_
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#define IV_GEN_H_
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typedef struct iv_gen_t iv_gen_t;
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#include <library.h>
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/**
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* Generic interface for initialization vector (IV) generators.
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*/
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struct iv_gen_t {
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/**
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* Generates an IV and writes it into the buffer.
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*
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* @param seq external sequence number
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* @param size size of IV in bytes
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* @param buffer pointer where the generated IV will be written
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* @return TRUE if IV allocation was successful, FALSE otherwise
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*/
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bool (*get_iv)(iv_gen_t *this, u_int64_t seq, size_t size,
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u_int8_t *buffer) __attribute__((warn_unused_result));
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/**
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* Generates an IV and allocates space for it.
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*
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* @param seq external sequence number
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* @param size size of IV in bytes
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* @param chunk chunk which will hold the generated IV
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* @return TRUE if IV allocation was successful, FALSE otherwise
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*/
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bool (*allocate_iv)(iv_gen_t *this, u_int64_t seq, size_t size,
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chunk_t *chunk) __attribute__((warn_unused_result));
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/**
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* Destroys an IV generator object.
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*/
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void (*destroy)(iv_gen_t *this);
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};
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/**
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* Select an IV generator for a given encryption algorithm.
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*
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* @param alg encryption algorithm
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* @return IV generator
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*/
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iv_gen_t* iv_gen_create_for_alg(encryption_algorithm_t alg);
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#endif /** IV_GEN_H_ @}*/
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